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Finding the Fourth Proportional to 305.12, 420.48 and 272.48

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Solution

The fourth proportional to 305.12, 420.48 and 272.48 is: 375.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.12 : 420.48 = 272.48 : x
  2. Step 2: Convert to fraction form
    305.12/420.48 = 272.48/x
  3. Step 3: Cross multiply
    305.12x = 420.48 × 272.48
  4. Step 4: Simplify right side
    305.12x = 114,572.39
  5. Step 5: Solve for x
    x = 114,572.39/305.12
  6. Step 6: Final answer
    x = 375.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.